<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>原生js拖动层</title>

<style type="text/css">
*{margin:0;padding:0;list-style-type:none;}
a,img{border:0;}
body{font:12px/180% Arial, Helvetica, sans-serif, "新宋体";}
/* content */
.content{width:900px;margin:40px auto 0 auto;}
.content .left{ float:left;width:20%;border:1px solid #FF0000;margin:3px;}
.content .center{float:left;border:1px solid #FF0000;margin:3px;width:57%}
.content .right{float:right;width:20%;border:1px solid #FF0000;margin:3px}
.mo{height:auto;border:1px solid #CCC;margin:3px;background:#FFF}
.mo h1{background:#ECF9FF;height:18px;padding:3px;cursor:move;text-align:left;font-size:12px}
.mo .nr{height:80px;border:1px solid #F3F3F3;margin:2px}
</style>
<script type="text/javascript">
var dragobj={}
window.onerror=function(){return false;}
function on_ini(){
	String.prototype.inc=function(s){return this.indexOf(s)>-1?true:false;}
	var agent=navigator.userAgent
	window.isOpr=agent.inc("Opera")
	window.isIE=agent.inc("IE")&&!isOpr
	window.isMoz=agent.inc("Mozilla")&&!isOpr&&!isIE
	if(isMoz){
		Event.prototype.__defineGetter__("x",function(){
			return this.clientX+2
		})
		Event.prototype.__defineGetter__("y",function(){
			return this.clientY+2
		})
	}
	basic_ini()
}
function basic_ini(){
	window.$=function(obj){
		return typeof(obj)=="string"?document.getElementById(obj):obj
	}
	window.oDel=function(obj){
		if($(obj)!=null){
			$(obj).parentNode.removeChild($(obj))
		}
	}
}
window.onload=function(){
	on_ini();
	var o=document.getElementsByTagName("h1");
	for(var i=0;i<o.length;i++){
		o[i].onmousedown=function(e){
			if(dragobj.o!=null);
			return false;
			e=e||event;
			dragobj.o=this.parentNode;
			dragobj.xy=getxy(dragobj.o);
			dragobj.xx=new Array((e.x-dragobj.xy[1]),(e.y-dragobj.xy[0]));
			dragobj.o.style.width=dragobj.xy[2]+"px";
			dragobj.o.style.height=dragobj.xy[3]+"px";
			dragobj.o.style.left=(e.x-dragobj.xx[0])+"px";
			dragobj.o.style.top=(e.y-dragobj.xx[1])+"px"   ;
			dragobj.o.style.position="absolute";
			var om=document.createElement("div");
			dragobj.otemp=om;
			om.style.width=dragobj.xy[2]+"px";
			om.style.height=dragobj.xy[3]+"px";
			dragobj.o.parentNode.insertBefore(om,dragobj.o);
			return false;
		};
	}
};
document.onselectstart=function(){
	return false;
};
window.onfocus=function(){
	document.onmouseup();
};
window.onblur=function(){
	document.onmouseup();
};
document.onmouseup=function(){
	if(dragobj.o!=null){
		dragobj.o.style.width="auto"
		dragobj.o.style.height="auto"
		dragobj.otemp.parentNode.insertBefore(dragobj.o,dragobj.otemp)
		dragobj.o.style.position=""
		oDel(dragobj.otemp)
		dragobj={}
	}
}
document.onmousemove=function(e){
	e=e||event;
	if(dragobj.o!=null){
		dragobj.o.style.left=(e.x-dragobj.xx[0])+"px";
		dragobj.o.style.top=(e.y-dragobj.xx[1])+"px";
		createtmpl(e);
	}
}
function getxy(e){
	var a=new Array()
	var t=e.offsetTop;
	var l=e.offsetLeft;
	var w=e.offsetWidth;
	var h=e.offsetHeight;
	while(e=e.offsetParent){
		t+=e.offsetTop;
		l+=e.offsetLeft;
	}
	a[0]=t;
	a[1]=l;
	a[2]=w;
	a[3]=h
	return a;
}
function inner(o,e){
	var a=getxy(o)
	if(e.x>a[1]&&e.x<(a[1]+a[2])&&e.y>a[0]&&e.y<(a[0]+a[3])){
		if(e.y<(a[0]+a[3]/2))
			return 1;
		else
			return 2;
	}else
		return 0;
}
function createtmpl(e){
	for(var i=0;i<12;i++){
		if($("m"+i)==dragobj.o)
		continue
		var b=inner($("m"+i),e)
		if(b==0)
		continue
		dragobj.otemp.style.width=$("m"+i).offsetWidth
		if(b==1){
			$("m"+i).parentNode.insertBefore(dragobj.otemp,$("m"+i))
		}else{
			if($("m"+i).nextSibling==null){
				$("m"+i).parentNode.appendChild(dragobj.otemp)
			}else{
				$("m"+i).parentNode.insertBefore(dragobj.otemp,$("m"+i).nextSibling)
			}
		}
		return
	}
	
	for(var j=0;j<3;j++){
		if($("dom"+j).innerHTML.inc("div")||$("dom"+j).innerHTML.inc("DIV"))
		continue
		var op=getxy($("dom"+j))
		if(e.x>(op[1]+10)&&e.x<(op[1]+op[2]-10)){
			$("dom"+j).appendChild(dragobj.otemp)
			dragobj.otemp.style.width=(op[2]-10)+"px"
		}
	}
}
</script>
</head>
<body>


<div class="content">
	<div class="left" id="dom0">
		<div class="mo" id="m0"><h1>dom0</h1><div class="nr"></div></div>
		<div class="mo" id="m1"><h1>dom1</h1><div class="nr"></div></div>
		<div class="mo" id="m2"><h1>dom2</h1><div class="nr"></div></div>
		<div class="mo" id="m3"><h1>dom3</h1><div class="nr"></div></div>
	</div>
	
	<div class="center" id="dom1">
		<div class="mo" id="m4"><h1>dom4</h1><div class="nr"></div></div>
		<div class="mo" id="m5"><h1>dom5</h1><div class="nr"></div></div>
		<div class="mo" id="m6"><h1>dom6</h1><div class="nr"></div></div>
		<div class="mo" id="m7"><h1>dom7</h1><div class="nr"></div></div>
	</div>
	
	<div class="right" id="dom2">
		<div class="mo" id="m8"><h1>dom8</h1><div class="nr"></div></div>
		<div class="mo" id="m9"><h1>dom9</h1><div class="nr"></div></div>
		<div class="mo" id="m10"><h1>dom10</h1><div class="nr"></div></div>
		<div class="mo" id="m11"><h1>dom11</h1><div class="nr"></div></div>
	</div>
</div>



</body>
</html>
